Connected: An Internet Encyclopedia
RFC 1521 - 7. The Predefined Content-Type Values

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### 7. The Predefined Content-Type Values

This document defines seven initial Content-Type values and an extension mechanism for private or experimental types. Further standard types must be defined by new published specifications. It is expected that most innovation in new types of mail will take place as subtypes of the seven types defined here. The most essential characteristics of the seven content-types are summarized in Appendix F.

7.1 The Text Content-Type

7.1.1. The charset parameter
7.1.2. The Text/plain subtype

7.2. The Multipart Content-Type

7.2.1. Multipart: The common syntax
7.2.2. The Multipart/mixed (primary) subtype
7.2.3. The Multipart/alternative subtype
7.2.4. The Multipart/digest subtype
7.2.5. The Multipart/parallel subtype
7.2.6. Other Multipart subtypes

7.3. The Message Content-Type

7.3.1. The Message/rfc822 (primary) subtype
7.3.2. The Message/Partial subtype
7.3.3. The Message/External-Body subtype

7.3.3.1. The "ftp" and "tftp" access-types
7.3.3.2. The "anon-ftp" access-type
7.3.3.3. The "local-file" and "afs" access-types
7.3.3.4. The "mail-server" access-type
7.3.3.5. Examples and Further Explanations

7.4. The Application Content-Type

7.4.1. The Application/Octet-Stream (primary) subtype
7.4.2. The Application/PostScript subtype
7.4.3. Other Application subtypes

7.5. The Image Content-Type
7.6. The Audio Content-Type
7.7. The Video Content-Type
7.8. Experimental Content-Type Values

Next: 7.1 The Text Content-Type

Connected: An Internet Encyclopedia
RFC 1521 - 7. The Predefined Content-Type Values